Which of the following statements best describes P-waves?
A. Move in a shearing manner and are the slowest type of seismic wave.
B. Move in a shearing manner and are the fastest type of seismic wave.
C. Move in a penetrating manner along the surface of the Earth.
D. Move in a compressional manner and are the fastest type of seismic wave.
E. Move in a compressional manner and are the slowest type of seismic waves.
Answer: D
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A. on the valley floor B. along the hillsides C. in any dry location D. on the top of the highest hill
After movement, the interior parts of ice slabs and continental plates
A) may be stretched. B) may be rippled up to form hills, ridges, and mountains. C) may be cracked to form crevices. D) remain unchanged.
In cities of less-developed countries, stream pollution is often ____.
A. not a problem because there are fewer industries B. caused by washing clothes in rivers C. caused by dumping 80-90% of raw sewage directly into rivers D. less severe compared to more-developed countries E. unaffected by cultural eutrophication
The Earth-Sun aphelion occurs once per year during the month of ________
A) January B) March C) July D) December E) September